Jonas Brothers -- Mystery Sober Coach Resurfaces

Kevin Jonas

Mystery Sober Coach Resurfaces

10/16/2013 6:10 AM PDT BY TMZ STAFF

The famous sober coach who was tagging along with Joe Jonas last week fueling rumors that possible substance abuse may have caused the band to teeter on the edge of breaking up resurfaced last night with the boys.

TMZ broke the story ... Mike Bayer -- the CEO and founder of Cast Recovery Services -- left Chateau Marmont in West Hollywood with Kevin Jonas, after Bayer met with the entire band.

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